/*
 * Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.dv8tion.jda.internal.utils;

import java.time.Clock;
import java.time.Instant;
import java.time.ZoneOffset;

import javax.annotation.Nonnull;

public class ClockProvider {
    private static Clock fixedTime = null;

    @Nonnull
    public static Clock getClock() {
        if (fixedTime != null) {
            return fixedTime;
        }
        return Clock.systemUTC();
    }

    public static void withFixedTime(@Nonnull Instant instant, @Nonnull Runnable runnable) {
        fixedTime = Clock.fixed(instant, ZoneOffset.UTC);
        try {
            runnable.run();
        } finally {
            fixedTime = null;
        }
    }
}
